technically all 50 do not
since even the lines that look straight on maps actually follow the curvature of the earth
but to answer the question you probably meant
only Hawaii
tho even Hawaii has straight looking lines in the borders of its counties
so again
technically all don't & none do
Hawaii is the only state with no straight edge borders.
Which two states have four straight lines as borders
because they want to
Utah, Colorado, and Wyoming
Colorado and Wyoming are the two US states with borders made up of 4 straight lines.
Most western states in the US were surveyed and divided into grids using the Public Land Survey System (PLSS) in the 19th century. This system was used to facilitate land sales and settlement, resulting in the characteristic straight lines and right angles seen in the state boundaries and land plots.
Four states in the United States have straight line borders: Colorado, Wyoming, Utah, and New Mexico. These straight line borders were established through surveying techniques rather than natural geographical features.
Colorado, New Mexico, Utah and Wyoming are the only ones I can think of.
Borders are determined either by natural formations such a s river or lake or by surveying which frequently is linked with longitude and latitude. The latter would be straight lines either N & S or E & W.
Hawaii
Only Colorado has "straight lines" for borders.
Hawaii and New Jersey
1 ( HAWAII )